What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[Sparksalot]

you "might" have to do a relearn on the ignition if you replaced the cylinder, not completely sure though on my 2012 there is a separate security ring module that goes around the end of the cylinder, if the security light stays lit with the key in the on position then that is your sign. On my nbs there was a sensor in the cylinder housing and I think it had to be relearned if the cylinder was replaced. did you re-key it? so you wont have to carry around 2 keys?

I did not rekey, just a simple switch swap.

by relearn do you mean with a tech2 or something else? My tech2 is several days away still.

 

[Doubeleive]

I did not rekey, just a simple switch swap.

by relearn do you mean with a tech2 or something else? My tech2 is several days away still.

if the security light is staying on solid with the key on, then you will need to do the 30 minute relearn, tech2 is not required and won't make it any faster of a process.
takes (3) 10 minute interval's, turn key on leave it for 10 minutes until security light goes out, turn key off then back to on for another 10 minutes until security light goes out, turn key off then back to on for a additional 10 minutes, when the security light goes out then turn the key off, wait a few seconds then you should be good to go.
after that has been completed if you have additional keys to program then you can use the programmed key for a quick relearn turn it to run when the security light goes out remove key and insert the next key and turn to run within 10 seconds, when the security light goes out, insert the next key and do the same for up to 4 keys. all keys must be done at the same time, once you have done the 30 minute relearn any other previous key's will not work unless you do the quick relearn with them as a follow up.

 

[89Suburban]

If I'm going to do this updated valve cover, what all would I need? Would the new cover come with a new gasket? Anything to clean inside?

I don't really want to tear into this as it's my daily and can't afford to be without it. I'm ok with cleaning inside and parts, but really replacing other stuff is not on the priority list.

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You may need a gasket. My gasket was like only like a year old so I just reused it. It's not bad of a job took me about an hour or so taking my time and pictures and such. 10MM and 8 mm sockets and pick tool for the connectors. Also however your PVC tube is attached I use a nylon tie on mine because it is a rubber hose.

Pop the intake cover off
Unplug the spark plug wires off the coils
Unplug the coil pack harness connector, there is a plastic locking insert you have to pop out first
Unplug the PVC hose
I think I also popped the vacuum hose out of the brake booster to make more space
5 10mm bolts for the coil pack rail, remove that
4 8mm cover bolts
Maybe move some wiring out of the way like the alt cable and injector harness


Not too bad

Some pics here if it helps


https://www.tahoeyukonforum.com/thr...redneck-mod-thread.124117/page-3#post-1530045

 

[CHOO CHOO]

You may need a gasket. My gasket was like only like a year old so I just reused it. It's not bad of a job took me about an hour or so taking my time and pictures and such. 10MM and 8 mm sockets and pick tool for the connectors. Also however your PVC tube is attached I use a nylon tie on mine because it is a rubber hose.

Pop the intake cover off
Unplug the spark plug wires off the coils
Unplug the coil pack harness connector, there is a plastic locking insert you have to pop out first
Unplug the PVC hose
I think I also popped the vacuum hose out of the brake booster to make more space
5 10mm bolts for the coil pack rail, remove that
4 8mm cover bolts
Maybe move some wiring out of the way like the alt cable and injector harness


Not too bad

Some pics here if it helps


https://www.tahoeyukonforum.com/thr...redneck-mod-thread.124117/page-3#post-1530045

It's supposed to come with a new gasket and bolts, so we will see. Should I spray/Clean anything inside or just leave all of it alone and swap covers

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[Geoffsfas10]

Mine is yet again, loaded back up with old subfloor, vinyl sheet and hardwood plank to take to work. Im over half way done though now.

 

[89Suburban]

It's supposed to come with a new gasket and bolts, so we will see. Should I spray/Clean anything inside or just leave all of it alone and swap covers

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That's great!!! Nah just clean the mounting gasket surface. Keep it simple. Also be aware apparently there are 2 types of covers depending on the year. I believe 07-08 have a different PCV valve than the 09 and up that "may" cause an engine light. I put an '09 and up on my '07 and it's been fine so far. Just wanted to let you know. It's in the GM tech bulletin. I found out too late after I bought a used one.

 

[wjburken]

It's supposed to come with a new gasket and bolts, so we will see. Should I spray/Clean anything inside or just leave all of it alone and swap covers

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When putting the new cover back on, make sure you check and recheck the torque specs. Doesn’t take much to cinch them down and too much will result in a snapped bolt. Ask me how I know.

 

[wsteele]

When putting the new cover back on, make sure you check and recheck the torque specs. Doesn’t take much to cinch them down and too much will result in a snapped bolt. Ask me how I know.

I agree.

On the gasket, Rock Auto list the left cover for a 2007 at like $106, pictures show bolts, grommets and gasket. The hole for the PCV is in the correct (updated) place. Interestingly, they list the 2014 gasket for like $74 and it includes the bolts, grommets and gasket as well. It too has the hole for the PCV in the right place. Strange as I believe they are the same cover.

Definitely don't get it at Napa, like $196.

 

[pwtr02ss]

They are flat 12 hours later.

idk if you have figured this out yet or not but my avalanche had a hole in the line that is ran inside the harness. I bought a line kit for a nbs and replaced it

 

[Sparksalot]

if the security light is staying on solid with the key on, then you will need to do the 30 minute relearn, tech2 is not required and won't make it any faster of a process.
takes (3) 10 minute interval's, turn key on leave it for 10 minutes until security light goes out, turn key off then back to on for another 10 minutes until security light goes out, turn key off then back to on for a additional 10 minutes, when the security light goes out then turn the key off, wait a few seconds then you should be good to go.
after that has been completed if you have additional keys to program then you can use the programmed key for a quick relearn turn it to run when the security light goes out remove key and insert the next key and turn to run within 10 seconds, when the security light goes out, insert the next key and do the same for up to 4 keys. all keys must be done at the same time, once you have done the 30 minute relearn any other previous key's will not work unless you do the quick relearn with them as a follow up.

Gotcha. I didn’t have a security light.